policies the school systems themselves apply.
Having to cover for quarantined or ‘sick’ teachers…. Healthcare workers can return to work after 5 days of initial onset of symptoms without being tested. Most teachers would balk heavily at that and many school districts want negative tests.
Policies that enable poor behavior by students naturally lead to disrespect of any authority teachers might have had
Policies based on giving individual students more power at the expense of the class or the teacher are often implemented.
The liberal policies that come with school districts leads to problem in the classroom.
These aren’t the only reasons obviously, society on the whole has swung so far to the progressive side and now we are seeing the direct results.